Add validate_abs_path() in test_load_nvidia_dynamic_lib.py

Author: rwgk

cuda_pathfinder/tests/test_load_nvidia_dynamic_lib.py

@@ -62,6 +62,12 @@ def build_child_process_failed_for_libname_message(libname, result):
     )
 
 
+def validate_abs_path(abs_path):
+    assert abs_path, f"empty path: {abs_path=!r}"
+    assert os.path.isabs(abs_path), f"not absolute: {abs_path=!r}"
+    assert os.path.isfile(abs_path), f"not a file: {abs_path=!r}"
+
+
 def child_process_func(libname):
     import os
 
@@ -70,6 +76,7 @@ def child_process_func(libname):
     loaded_dl_fresh = load_nvidia_dynamic_lib(libname)
     if loaded_dl_fresh.was_already_loaded_from_elsewhere:
         raise RuntimeError("loaded_dl_fresh.was_already_loaded_from_elsewhere")
+    validate_abs_path(loaded_dl_fresh.abs_path)
 
     loaded_dl_from_cache = load_nvidia_dynamic_lib(libname)
     if loaded_dl_from_cache is not loaded_dl_fresh:
@@ -80,6 +87,7 @@ def child_process_func(libname):
         raise RuntimeError("loaded_dl_no_cache.was_already_loaded_from_elsewhere")
     if not os.path.samefile(loaded_dl_no_cache.abs_path, loaded_dl_fresh.abs_path):
         raise RuntimeError(f"not os.path.samefile({loaded_dl_no_cache.abs_path=!r}, {loaded_dl_fresh.abs_path=!r})")
+    validate_abs_path(loaded_dl_no_cache.abs_path)
 
     sys.stdout.write(f"{loaded_dl_fresh.abs_path!r}\n")